Nutrition is the science that interprets the interaction of nutrients and other substances in food in relation to maintenance, growth, reproduction, health and disease of an organism. It includes food intake, absorption, assimilation, biosynthesis, catabolism, and excretion.

The diet of an organism is what it eats, which is largely determined by the availability and palatability of foods. For humans, a healthy diet includes preparation of food and storage methods that preserve nutrients from oxidation, heat or leaching, and that reduces risk of foodborne illnesses.

Why follow nutrition diet

About the same time in Italy, Alcmaeon of Croton wrote of the importance of equilibrium between what goes in and what goes out, and warned that imbalance would result in disease marked by obesity or emaciation.

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Hart started the cow feeding, single-grain experiment, which took nearly four years to complete. Poor health can be caused by a lack of required nutrients, or for some vitamins and minerals, too much of a required nutrient. Lavoisier discovered the principle of conservation of mass. His ideas made the phlogiston theory of combustion obsolete.

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The list of nutrients that people are known to require is, in the words of Marion Nestle, “almost certainly incomplete”. As of 2014, nutrients are thought to be of two types: macronutrients which are needed in relatively large amounts, and micronutrients which are needed in smaller quantities. for both mechanical and biochemical reasons, although the exact reasons remain unclear. Some nutrients can be stored – the fat-soluble vitamins – while others are required more or less continuously. Poor health can be caused by a lack of required nutrients, or for some vitamins and minerals, too much of a required nutrient.